/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.bbstone.pisces.client;

import com.bbstone.pisces.client.base.ClientCmdRegister;
import com.bbstone.pisces.config.Config;
import com.bbstone.pisces.util.ConstUtil;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.util.CharsetUtil;
import lombok.extern.slf4j.Slf4j;

import java.io.File;

/**
 * Sends one message when a connection is open and echoes back any received
 * data to the server.  Simply put, the echo client initiates the ping-pong
 * traffic between the echo client and server by sending the first message to
 * the server.
 */
@Slf4j
public final class FileClient {
//    static final boolean SSL = Config.sslEnabled();
//    static final String HOST = Config.host();
//    static final int PORT = Config.port();

    public void startup() {
        // Configure the client.
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            ClientCmdRegister.init();
//          ClientCache.cleanAll();
            // Configure SSL.
            final SslContext sslCtx;
            if (Config.sslEnabled()) {
                File certChainFile = Config.clientSSLCertChainFile();
                File keyFile = Config.clientSSLKeyFile();
                File rootFile = Config.clientSSLRootFile();
                sslCtx = SslContextBuilder.forClient().keyManager(certChainFile, keyFile).trustManager(rootFile).build();
            } else {
                sslCtx = null;
            }

            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY, true)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {

                            ChannelPipeline p = ch.pipeline();
                            if (sslCtx != null) {
                                p.addLast(sslCtx.newHandler(ch.alloc()));
                            }
                            // outbound(BFileReq)
                            p.addLast(new ProtobufEncoder());

                            // --- inbound
                            // if os not support zero-copy/sslEnabled, used this, must be the first inbound handler
                            p.addLast(new ChunkedReadHandler());

                            // ----- decode and handle (BFileRsp + FileRegion) data stream
                            ByteBuf delimiter = Unpooled.copiedBuffer(ConstUtil.delimiter.getBytes(CharsetUtil.UTF_8));
                            // inbound frameLen = chunkSize[default: 8192] + BFileRsp header)
//                            p.addLast(new DelimiterBasedFrameDecoder(10240, delimiter));
                            p.addLast(new DelimiterBasedFrameDecoder(Integer.MAX_VALUE, delimiter));
                            p.addLast(new FileClientHandler());
                        }
                    });


            // Start the client.
            ChannelFuture f = b.connect(Config.host(), Config.port()).sync();

            // Wait until the connection is closed.
            f.channel().closeFuture().sync();
        } catch (Exception e) {
            log.error("startup client error.", e);
        }
        finally {
            // Shut down the event loop to terminate all threads.
            group.shutdownGracefully();
        }
    }
}
